Electron gun assembly for a color cathode ray tube apparatus

Details Electron gun assembly for a color cathode ray tube apparatus Electron gun assembly for a color cathode ray tube apparatus

1996-12-06

1998-04-28

Blum, Theodore M.

Electric lamp and discharge devices: systems

Cathode ray tube circuits

Cathode-ray deflections circuits

315 15, 313414, 313449, H01J 2958

Patent

active

057449171

ABSTRACT:
In a color cathode ray tube apparatus, three electron beams emitted from cathodes form cross-over points and diverge from the cross-over points, respectively. Each of the diverged electron beams is guided through a first quadruple electron lens, a sub-lens, a second quadruple electron lens, and a main lens to a phosphor screen. The sub-lens has lens power for converging the electron beam. The first quadruple electron lens has first horizontal and vertical lens powers for diverging and converging the electron beam in the horizontal and vertical planes, respectively. The second quadruple electron lens has second horizontal and vertical lens powers for converging and diverging the electron beam in the horizontal and vertical planes, respectively. The main lens has a focusing lens power for focusing the electron beam onto the screen. The first and second horizontal and vertical lens powers and the focusing lens power are varied depending on the deflection of the electron beam. The horizontal lens power of the first quadruple electron lens is varied so as to substantially cancel the horizontal lens power of the sub-lens in the horizontal plane.

REFERENCES:
patent: 5061881 (1991-10-01), Suzuki et al.
patent: 5212423 (1993-05-01), Noguchi et al.
patent: 5386178 (1995-01-01), Son et al.

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